本文選題：重力壩壩基面 + 抗滑穩(wěn)定��； 參考：《大連理工大學(xué)》2014年碩士論文

【摘要】：對于重力壩壩基面抗滑穩(wěn)定性,早期是使用傳統(tǒng)安全系數(shù)法來進(jìn)行安全評價的,但是此方法不能考慮基本參數(shù)實(shí)際存在的隨機(jī)性,得到的計算結(jié)果不能完全反映客觀實(shí)際。于是規(guī)范進(jìn)一步規(guī)定以可靠度理論為基礎(chǔ)的分項(xiàng)系數(shù)法來進(jìn)行重力壩設(shè)計,使定值設(shè)計轉(zhuǎn)變?yōu)榉嵌ㄖ翟O(shè)計,以期做到重力壩設(shè)計的進(jìn)一步科學(xué)化、合理化。本文基于隨機(jī)可靠度理論,采用多種可靠度計算方法對重力壩壩基面抗滑穩(wěn)定性進(jìn)行了研究,主要內(nèi)容包括： 首先,本文較系統(tǒng)地闡述了幾種可靠度計算方法的相關(guān)理論。從理論上分析了各種可靠度計算方法的特點(diǎn)和可能存在的不足,以及某些計算方法之間的聯(lián)系。為應(yīng)用可靠度分析方法研究重力壩壩基面的抗滑穩(wěn)定性奠定了理論基礎(chǔ)。 其次,對傳統(tǒng)安全系數(shù)法和分項(xiàng)系數(shù)法進(jìn)行了介紹,應(yīng)用以上兩種方法對某水庫典型壩段壩基面抗滑穩(wěn)定性進(jìn)行了安全評價。但是兩種方法得到的結(jié)論不一致,傳統(tǒng)安全系數(shù)法得到的結(jié)論是該壩段壩基面不滿足抗滑要求,而分項(xiàng)系數(shù)法得到的結(jié)論是滿足抗滑要求。初步分析了造成結(jié)論不一致的原因,從而明確本文下一步研究的重要性。 最后,結(jié)合上述工程實(shí)例,采用多種可靠度計算方法對壩基面的抗滑穩(wěn)定性進(jìn)行了詳細(xì)研究。通過對各隨機(jī)變量進(jìn)行敏感性分析,得出抗剪斷摩擦系數(shù)、黏聚力和上游水位是三個主要敏感因子�？辜魯嗄Σ料禂�(shù)和黏聚力的概率分布類型的改變對三個主要敏感因子的敏感系數(shù)影響比較大。不考慮抗剪斷摩擦系數(shù)和黏聚力之間的負(fù)相關(guān)性得到的重力壩壩基面抗滑穩(wěn)定性可靠指標(biāo)偏小,計算結(jié)果偏于安全。抗剪斷摩擦系數(shù)和黏聚力均服從正態(tài)分布時,計算得到的可靠指標(biāo)偏小,抗剪斷摩擦系數(shù)和黏聚力概率分布類型的改變對可靠指標(biāo)有較大的影響。不考慮抗剪斷摩擦系數(shù)、黏聚力和上游水位變量截尾分布時,計算得到的可靠指標(biāo)偏小,其中考慮上游水位截尾分布對可靠指標(biāo)的影響最大。通過對各可靠度計算方法在本文工程實(shí)例中的對比研究,得出廣義JC法和廣義映射變換法的實(shí)用性最強(qiáng)。 綜合各種方法的安全評價結(jié)論,本文認(rèn)為工程實(shí)例中的重力壩壩基面滿足抗滑要求。
[Abstract]:The traditional safety factor method is used to evaluate the anti-slide stability of gravity dam foundation surface in the early stage, but this method can not consider the randomness of the actual existence of the basic parameters, and the calculated results can not reflect the objective reality completely. So the code further stipulates that the method of partial coefficient based on reliability theory is used to design gravity dam, so that the design of fixed value can be changed into non-fixed value design, in order to make the design of gravity dam more scientific and reasonable. Based on the theory of random reliability, this paper studies the stability of gravity dam foundation surface against sliding by using various reliability calculation methods. The main contents are as follows: First of all, this paper systematically describes several reliability calculation methods related to the theory. In this paper, the characteristics of various reliability calculation methods and their possible shortcomings are analyzed theoretically, as well as the relations between some calculation methods. It lays a theoretical foundation for the application of reliability analysis method to study the stability of gravity dam foundation surface. Secondly, the traditional safety factor method and the sub-factor method are introduced, and the safety evaluation of the anti-slide stability of the dam foundation surface of a typical dam section of a reservoir is carried out by using the above two methods. However, the conclusions obtained by the two methods are inconsistent. The traditional safety factor method has come to the conclusion that the dam foundation surface of the dam section does not meet the requirements of anti-slide, while the conclusion obtained by the sub-factor method is that the anti-slide requirement is satisfied. The reason of the inconsistency is analyzed, and the importance of the next research in this paper is clarified. Finally, the anti-slide stability of the dam foundation surface is studied in detail by using various reliability calculation methods combined with the above engineering examples. Through the sensitivity analysis of each random variable, it is concluded that the friction coefficient of shear resistance, cohesion force and upstream water level are three main sensitive factors. The change of the probability distribution type of shear friction coefficient and cohesion force has a great influence on the sensitivity coefficient of the three main sensitive factors. Without considering the negative correlation between shear friction coefficient and cohesive force, the reliability index of anti-slide stability of gravity dam foundation surface is small, and the calculation result is safety. When the shear friction coefficient and the cohesion force are obtained from the normal distribution, the calculated reliability index is small, and the change of the shear friction coefficient and the probability distribution type of the cohesion force has a great influence on the reliability index. When the shear friction coefficient is not considered, the reliability index is small when the cohesion force and the tail distribution of the upstream water level variables are considered, and the influence of the upstream water level truncation distribution on the reliability index is the greatest. By comparing and studying the reliability calculation methods in this paper, it is concluded that the generalized JC method and the generalized mapping transformation method are the most practical. Synthesizing the safety evaluation conclusions of various methods, this paper thinks that the dam foundation surface of gravity dam in engineering example can meet the requirement of anti-slide.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV223

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